nanog mailing list archives
Re: Domain names for ISP infrastructure links
From: Rob Liebschutz <rob () rjl com>
Date: Tue, 7 Jan 97 16:10:32 PST
I'm puzzled. Connections go from router to router. How does it help to say routerb-x-y-z-routerc.blah.net when routerc will show up as the next hop in the traceroute?I think it will help when routerc fails to show up as the next hop :)No.
Actually yes. At first I had the same thought that you did, but knowing which router the packet was supposed to have come from makes it easy to tell from the output of a traceroute weather the routing changed in the middle. Having to use IP addresses to figure this out is much more work. On the other hand, I do question the idea of trying to cram all this info into the the interface names in the DNS.
Traceroute gives you the incoming interface on a router. For a given incoming interface on a router there are multiple next hop routers (and multiple outgoing interfaces). Knowing that the outgoing interface that a packet came from on the previous hop router is not worth adding to the DNS. If this is a point-to-point link, as you seem to be assuming, then it should be subnetted as a /30 and you can thus subtract or add 1 to the IP address as appropriate to find the previous hop's outgoing interface, if that information is important to you. If it is a multiple-access link, then there is no chance of the incoming interface being specific to a particular previous hop anyway, so this scheme falls apart. --jhawk
- - - - - - - - - - - - - - - - -
Current thread:
- Re: Domain names for ISP infrastructure links, (continued)
- Re: Domain names for ISP infrastructure links Alex.Bligh (Jan 08)
- Re: Domain names for ISP infrastructure links David Carmean (Jan 07)
- Re: Domain names for ISP infrastructure links Wayne Bouchard (Jan 07)
- Re: Domain names for ISP infrastructure links Michael Dillon (Jan 07)
- Re: Domain names for ISP infrastructure links Paul A Vixie (Jan 07)
- Re: Domain names for ISP infrastructure links Mark A. Fullmer (Jan 29)
- Re: Domain names for ISP infrastructure links Peter Lothberg (Jan 06)
- Re: Domain names for ISP infrastructure links Dima Volodin (Jan 06)
- Re: Domain names for ISP infrastructure links Andrew Partan (Jan 11)
- Re: Domain names for ISP infrastructure links -Reply Rory Young (Jan 07)
- Re: Domain names for ISP infrastructure links Rob Liebschutz (Jan 07)
- Re: Domain names for ISP infrastructure links John Curran (Jan 07)
- Re: Domain names for ISP infrastructure links Philip J. Nesser II (Jan 07)
- Re: Domain names for ISP infrastructure links Dorian R. Kim (Jan 07)
- Re: Domain names for ISP infrastructure links Alex.Bligh (Jan 08)
- Re: Domain names for ISP infrastructure links Robert E. Seastrom (Jan 08)
- Re: Domain names for ISP infrastructure links Billy Biggs (Jan 08)
- Re: Domain names for ISP infrastructure links Vadim Antonov (Jan 07)
- Re: Domain names for ISP infrastructure links Dorian R. Kim (Jan 07)
- Re: Domain names for ISP infrastructure links Matthew Petach (Jan 08)
- Re: Domain names for ISP infrastructure links Vadim Antonov (Jan 08)
(Thread continues...)